Let Me Atom Atoms! Practice Atom Test

This atom has ___ 3 electrons.

• lost

• gained

If an atom has an atomic mass of 27 and an atomic number of 13, how many neutrons does it have?

• 11

• 14

• 27

• 34

Answer explanation

Remember:

#neutrons = mass number - atomic number

This atom has a charge of ___.

(protons = orange)

• 2-

• 1-

• 0

• 1+

• 2+

When atoms of group 13 elements become ions, they ___ valence electrons and get a charge of ___.

• lose 2 / 2+

• gain 2 / 2-

• lose 3 / 3+

• gain 3 / 3-

The atomic mass of an element is determined by the sum of the masses of which subatomic particles?

• Protons and electrons

• Neutrons and electrons

• Protons and neutrons

• Electrons only

What is the term used to describe atoms of the same element that have different numbers of neutrons?

• Allotropes

• Isomers

• Isotopes

• Alloys

When lithium becomes an ion, it has a positive charge.

Ions with positive charge are called ____.

• anions

• cations

This atom has ___ neutrons.

• 3

• 13

• 14

• 27

• 40

Which particle is the atomic number on the periodic table based on?

• proton

• neutron

• electron

Group ___ atoms and metalloids (semiconductors, semimetals) can gain or lose valence electrons to become positive or negative ions.

• 13

• 14

• 15

• 16